4-(2,3-dichloro-4-valerylphenoxy)butyric acid 、
4-(2,3-dichloro-4-butyrylphenoxy)butyric acid 以there was obtained 4-[2,3-dichloro-4-(2-methylenevaleryl)phenoxy]butyric acid, m.p. 85°-87° C.的产率得到4-<2,3-dichloro-4-(2-methylenevaleryl)phenoxy>butyric acid